Properties of the Number -251980

Two Hundred Fifty-One Thousand Nine Hundred Eighty

Basics

Value: -251981 → -251980 → -251979

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2 ² × 5 × 43 × 293

Divisors: 1, 2, 4, 5, 10, 20, 43, 86, 172, 215

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: -111101100001001100

Octal: -754114

Duodecimal: -1019A4

Hexadecimal: -3d84c

Square: 63493920400

Square Root: 501.97609504835987

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

a(n) = number of (s(0), s(1), ..., s(n)) such that every s(i) is an integer, s(0) = 0, |s(i) - s(i-1)| = 1 for i = 1,2; |s(i) - s(i-1)| <= 1 for i >= 3, s(n) = 1. Also a(n) = T(n,n-1), where T is the array defined in A024996. A24998

a(n) = ∑_k=0..2n-1 T(n,k) * T(n,k+1), with T given by A025177. A27258